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MB3887
20
■
AC ADAPTOR VOLTAGE DETECTION
• With an external resistor connected to the +INE2 terminal (pin 3) , the IC enters the dynamically-controlled
charging mode to reduce the charge current to keep AC adapter power constant when the partial potential
point A of the AC adapter voltage (VCC) becomes lower than the voltage at the −INE2 terminal.
AC adapter detection voltage setting : Vth
Vth (V) = (R1 + R2) / R2 × −INE2
■
OPERATION TIMING DIAGRAM
−
+
VCC
R1
R2
+INE2
−INE2
A
<Error Amp2>
4
3
2.5 V
1.5 V
Error Amp2 FB2
Error Amp1 FB1
Error Amp2 FB3
OUT
Constant voltage control Constant current control
AC adapter dynamically-
controlled charging